Dental drill



R. KESTLER DENTAL DRILL Oct. 20, 1942.

Filed Nov 1, 1941 INVENTOR BY E0406 Kesf/er WW A'II'TORNEY I Patented Oct. 20, 1942 UNITED STATES o rrrcs 2 Claims.

The present invention relates to an improvement in dental drills and more particularly to a device for guiding a drill.

The object of the present invention is to pro- Vide a device for drilling or cutting interior or exterior walls in the teeth of a patient so that all of said Walls will be parallel to each other while the patient holds the device in his mouth.

Another object of the present invention is to provide a device which is inexpensive to manufacture, light in weight and durable in structure.

In using the drill without the assistance of the present invention the dentist encounters great difficulty in drilling parallel walls of separated teeth so that two or more crowns which support intermediate bridge work will fit properly, and most of the time the wall of one or both teeth will be undercut or out of line and necessitate a great deal of work to provide a perfect fit, but with the present invention, however, all of these difficulties are obviated, and a perfect fit is assured with the first drilling.

Other objects of the present invention will be brought out in the following specification.

Reference will be had to the accompanying drawing forming a part of this specification in which similar reference characters indicate corresponding parts throughout the several views, in which:

Fig. l is a top plan view of one embodiment of the present invention Fig. 2 is a front elevation of Fig. 1

Fig. 3 is a detail in vertical section of the drill holder.

Fig. 4 is a small perspective showing in a general way the device in use, and

Fig. is a diagrammatic view showing the parallel cut lines on two separated teeth.

Referring to the drawing wherein I have shown, by way of illustration merely, a device for guiding a dental drill comprising a plastic compound mouth pad ill, supporting a bracket II, which is integral with a cup I2. The cup |2 encloses a ball |3 which is held rigidly by a lock nut I4 to rigidly hold a pin l5 in various angular positions.

Slidably mounted upon the pin I5 is a sleeve l6, which has an integral arm projecting at right angles therefrom and said arm is provided with an enlarged portion l8 which fits into a bifurcated portion IS on a link 2|].

The linkifi also has a similar enlarged portion 2| fitting into a bifurcated portion 22 on a pin 23, and both of these joints l8 and 2| have ball bearings 25 which are held in place by set screws 24' to permit of easy motion. The pin 23 carries a drill holder 25 which has a split sleeve 25 clamped around the pin 23 by a clamp 21.

The drill holder sleeve 26 is integral with a nut 28 (see Fig. 2) for receiving a pin 29 on the drill holder proper 30.

The drill holder proper 30 is normally held against a seat 3| in the bottom of the nut 28 by reason of a spring 32 the function of which will be hereinafter described.

A spring housing 33 is screwed to the reduced portion 34 of the nut 28, and to keep the spring 32 and pin 29 in proper position I have provided a set screw 35 secured to the upper end of the pin 29. The drill 36 is securely clamped to the holder 30 by the clamp 31 which is similar in every respect to the clamp 21.

In operating the device the dentist first heats the mouth pad II], which is a plastic compound and easily softened, and then inserts the pad into the patients mouth as shown in Fig. 4. The patient must bite down on this pad H] to hold the device while the dentist does the cutting. After the patient bites down on the pad It), the nut I4 on the ball joint is loosened and the pin I5 is placed at the proper angular position relative to the vertical axis of the tooth about to be cut. The nut I4 is then tightened and the device is ready to cut any number of teeth walls all parallel to each other.

Suppose in Figs. 4 and 5 the pin |5 is set corresponding to the vertical axis of the tooth A, the dentist will cut tooth A parallel to the vertical axis of the pin l5 since the sleeve l6 rides up and down on this pin l5 and carries all the arms and linkage with it, the drill 36 will of course follow the same axial path as the sleeve l6, and when the drill 36 is moved over to tooth B the same path is followed as in tooth A.

Therefore, all the lines C-C in Fig. 5 will be cut parallel to each other as long as the patient holds the pad between his teeth. This allows of a nice fit for crown bridge Work or interior connections and can be accomplished with great ease and celerity, thereby insuring a perfect fit in the first instance.

It will of course be understood that the showing here is merely illustrative and many modifications and niceties of adjustment can be made without departing from the principle of the present invention.

I claim:

1. A device of the kind described comprising a plastic compound pad adapted to be held in the mouth of a patient, a ball joint carrying an adjustable vertical pin, a sleeve riding on said pin, an integral arin connected to said sleeve, a link connected to said arm, a drill holder carrying a drill connected to the other end or said link, and means comprising said sleeve for guiding said drill for cutting adjacent teeth walls parallel to each other.

2 A device for cutting or drilling all parallel walls inside or outside of adjacent teeth, cam; prising a plastic compound mouth pad adapted to be held between the upper and lower teeth of a patient, an arm rigidly secured to said mouth pad, a, ball socket rigidly secured to said arm, an angular adjustable pin having a ball on the lower end thereof seated in said ball socket, means for tightening said ball, a sleeve movably mounted on said pin, an arm integral with said sleeve, a linkage movably connected to said arm, a drill holder adapted to receive a drill secured to said linkage, means in said drill holder to 'perof free movement of said drill in a horizontal plane, and means comprising said sleeve riding up and down on said pin for guiding said drill in the same path as said sleeve.

RALPH KES'I'LER. 

